Abrasive blasting is the most versitle,options include silica sand,aluminum oxide,glass beads,black slag,walnut hulls,soda,crsuhed glass,corn cob,steel shot and coffee media.
You will need a decent compressor(120 psi at least 12cfm free air)though.
I have a HF vibratory drum,it's okay,but slow and won't take liquid.
HF does however sell extra drums for the machine at around $12 including walnut shells.
I have been thinking recently of making one with three drums on one base using my own motor and belt driven.Then fluid could be used and increse the effect.
I just need one more tool,just one!